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Automatic replies sent by the e-mail software of the recipient after receipt of an e-mail.

e-mail sent back to the server that originally sent the e-mail.

Ratio of bounced e-mails to total e-mails sent.

Terms used by spammers to refer to their line of work. Mostly synonymous with spam or UCE.

Words in the e-mail that entice recipients to do something.

The action of clicking on a link.

Ratio of click-throughs to total e-mails sent.

Any e-mail sent for commercial purpose; for instance, an advertisement to buy a product or service, an order confirmation from an online store, or a paid subscription periodical delivered by e-mail. Commercial e-mail is not synonymous with spam; see unsolicited commercial e-mail below.

Characteristic of a group of e-mail recipients.

A term coined by spammers to refer to the normal operation of secure electronic mailing list software. A new subscriber first gives his/her address to the list software (for instance, on a Web page) and then confirms subscription after receiving an e-mail asking if it was really him/her. This ensures that no person can subscribe someone else out of malice or error. The intention of the term "double opt-in" is to make it appear that the confirmation is a duplication of effort; and thus, to justify not confirming subscriptions. Mail system administrators and non-spam mailing list operators refer to confirmed subscription or closed-loop opt-in.

Same as Opt-In, but the recipient unsubscribes instead of subscribes. Borderline spam operations frequently make it difficult to unsubscribe from lists, in order to keep their lists large. Hard-core spam operations make it impossible -- they treat opt-out requests as confirmations that the address works and is read.

An e-mail sent to multiple recipients, intended to inform them of announcements, events or changes. A variety of methods can be used to send the same e-mail to multiple recipients: for example: using options within an e-mail program, using the mail merge option within a word processing program, or using a commercial e-mail list programs.

A recipient agrees actively to subscribe by checking a box on a web form, paper form or by telephone. A recipient not unchecking a box is not express consent.

E-mail that is not spam but is labeled spam by a spam filter of the recipient. Note that e-mail marketers may have different opinions of what is "spam" than e-mail recipients.

E-mails can be sent in plain text, HTML, or Microsoft's rich text format.

Bounced e-mail that could never get through because the e-mail address doesn't exist or the domain doesn't exist.

Reseller of lists of e-mail addresses.

Process of generating a list of e-mail addresses for use in e-mail campaigns.

Web service that provides tools to manage large e-mail address databases and to distribute large quantities of e-mails.

Owner or operator of opt-in e-mail newsletters or databases. Also software used to maintain a mailing list.

Appearance, layout, design, functions & anything not directly related to the actual message on an e-mail.

E-mail open rate measures the ratio of e-mails "opened" to the number sent or "delivered." The ratio is calculated in various ways, the most popular is: e-mails delivered (sent - hard bounces) /unique opens.

The action of agreeing to receive e-mails from a particular company, group of companies or associated companies, by subscribing to an e-mail list.

A mailing list which transmits e-mails to people who have not subscribed and lets them "opt-out" from the list. The subscribers' e-mail addresses may be harvested from the web, USENET, or other mailing lists. ISP policies and some regions' laws consider this equivalent to spamming.

The use of technology and customer information to tailor e-mails between a business and each individual customer. Using information previously obtained about the customer, the e-mail is altered to fit that customer's stated needs as well as needs perceived by the business based on the available customer information, for the purpose of better serving the customer by anticipating needs, making the interaction efficient and satisfying for both parties and building a relationship that encourages the customer to return for subsequent purchases.

The Privacy Act of 1974, Public Law 93-579, safeguards privacy through creating four procedural rights in personal data. It requires government agencies to show an individual any records kept on him/her; also requires agencies to follow "fair information practices" when gathering and handling personal data. It places restrictions on how agencies can share an individual's data with other people and agencies and also lets individuals sue the government for violating its provisions.

A mailing list that can only be used once or for a limited time. The user of the list pays the owner of the list less money than if he/she would have bought the list outright. Note that this term is usually used for lists generated by address harvesting or other means; the investment made by the list creator does not correlate with the permission of the e-mail recipients. Many firms who "rent" or "buy" a list face spam complaints afterward from persons who never subscribed.

The use of previously gathered information to send e-mails of a particular offer to a subset of the list.

A soft bounce is an e-mail that gets as far as the recipient's mail server but is bounced back undelivered before it gets to the intended recipient. it might occur because the recipient's inbox is full. A soft bounce message may be deliverable at another time or may be forwarded manually by the network administrator in charge of redirecting mail on the recipient's domain. On the other hand, a hard bounce is an e-mail message that has been returned to the sender because the recipient's address is invalid.

From the sender's point-of-view, spam is a form of bulk mail, often sent to a list obtained by companies that specialize in creating e-mail distribution lists. To the receiver, it usually seems like junk e-mail. Spam is equivalent to unsolicited telemarketing calls except that the user pays for part of the message since everyone shares the cost of maintaining the Internet. Spammers typically send a piece of e-mail to a distribution list in the millions, expecting that only a tiny number of readers will respond to their offer. The term spam is said to derive from a famous Monty Python sketch ("Well, we have Spam, tomato & Spam, egg & Spam, Egg, bacon & Spam...") that was current when spam first began arriving on the Internet. SPAM is a trademarked Hormel meat product that was well-known in the U.S. Armed Forces during World War II.

Software that is usually installed in the users e-mail client, with the purpose of avoiding spam e-mail to get into the client's inbox or at least to be flagged as such.

It is one of the most important issues in e-mail marketing. The better the subject line of an e-mail, the better probability of being opened by the recipient.

Sending e-mails to a subset of a mailing list based on a specific filter, trying to improve CTR and/or open ratios.

The act of reporting CTR, open ratios, bounces, etc.

Triggering a message based on an event or interaction with a previous message. Popular for customers who request more information

During a particular period, a visitor to a website could click several times on a particular link, but during that period it is counted only as one and considered a unique visitor.

The subset of e-mail spam that is also commercial, usually of an advertising nature, sent at the expense of the recipient without his or her permission. Sending UCE is an offense against all major ISPs' terms of service, and is a crime in some jurisdictions.